Feeding device for punch-presses



L s. HAssELsTBon/l. FEEDING DEVICE FOR PUNCH PRESSES. APPLICATION FILED SEPT. 23 1918.

. Patented July 6, 1920.`

Il Il l! n i A IVAR S. HASSELSTROM, OF CHICAGO,

. tion.

ILLINOIS, ASSIGNOR, BY MESNE PATET! OFFICE.

ASSIGNMENTS,

TO MGGILL MANUFACTURING COMPANY, OF VALPARAISO, INDIANA, A CORPORA- TION OF INDIANA.

FEEDINGr DEVICE A11011. PUNCH-PRESSES.

intense.

Specification of Letters Patent..

Patented July 6, 1920..

Application filed September 23, 1918. Serial No. $355,248.

To all who/1t t may concern.'

Be it known that I, Ivan S. HAssELsTRoM, a citizen of the United States, residing at Chicago, in the county of Cook and State of Illinois, have invented a certain new and useful Improvement in Feeding Devices for Ilunch-Ijresses, of which the following is a full, clear, concise, and exact description, reference being had to the accompanying drawings, forming a part of this specifica- My invention relates to feeding devices for punch presses and has to do more particularly with devices of the character in which the material to be punched is progressively fed as the press is operated. One of the features of my invention is the provision of a reciprocatory feed-pawl which is adapted to directly engage the material, preferably engaging the edge of the opening produced by the punch, so that upon each operation of the press the material is advanced sufliciently to provide another blank space to be punched. Thus a most accurate and positive feed is provided and one in which no variation of advance occurs.

I41 or a better understanding of my invention reference is to be had to the accompanying drawing illustrating several preferred embodiments in which* .Figure 1 is a perspective view of one form of my invention in which the feed mechanism is operated upon the down stroke of the press;

Fig. 2 is a side view of the feed-pawl carrying lever; and

AI41 ig. 3 is a modified form of my invention in which the feed-pawl is operated to advance the material upon the upstroke of the press.

Referring now more particularly to the preferred form of my invention as illustrated in Fig. 1, it is shown applied to a well known type of punch press comprising the usual frame 4, bolster plate 5 and slide 6 which is reciprocated by the usual connecting rod 7. I have not shown the punch press driving mechanism as this may be of any type. F or the purpose of illustration I have shown an ordinary round punch 8 and die 9l and a strip of material 1() which passes between the stripper plate 11 and die 9 in the usual manner.

vFor the purpose of feeding or advanng This feed-pawl 12 is pivotally supported by a lever A, a spring 14: being provided to press the pawl 12 into operative engagement with the material 10. The lever A preferably consists of a front plate 15 and back plate 16 spaced apart by means of a separator 17 and secured in a suitable manner preferably by riveting. The lever is pivotally attached at 18 to the way 19 of the press and a spring 2O for returning the lever is attached at one end to an arm 21 which is secured to the side of the way 19 while the other-end of the spring 20 is hooked over the extension 22 of the arm A. This lever A preferably reciprocatory and` with its feed-pawl 12 is preferably recipro-I cated by direct engagement with a movable supported between the sides 15 and 17 of the lever A. This arm or cam 23 may be secured in any suitable way but I preferably provide adjustable clamping means in the form of a bolt 241 which extends through slots in the sides of the arm A and the intermediately positioned cam 23. In order to rigidly hold this arm or cam 23 against displacement I provide a 4set screw 25 which may be threaded into any of the adjacent openings, according to the adjustment of the cam 23 and then screwed into locking engagement therewith. In the drawing I have shown the feed mechanism as being operated by the anchor lug 26 usually carried alongside of the slide 6. Thus upon each down stroke of the slide, the lower outer edge of the lug 26 engages the cam 23 moving the arm A downwardly so that the feed-pawl 12 moves the strip of material 10 the proper distance. The feed mechanism is so adjusted that the material 10 is'advanced the proper distance before the punch 8 comes into engagement therewith so that the farther downward movement of the slide 6 does not edect any ,farther advance of the sheet. lIn the present form of my invention this is accomplished by having the outer mains stationary until the slide 6 has again moved upwardly far enough to permit a return stroke of the feed mechanism. As the slide moves upwardly the arm A is moved i back to engage the next opening 13 inthe strip there is no opportunity for the material to be moved a lesser or greater distance than what the feed is adjusted for.

In starting a new blank strip 10, it is first fed by hand until a punched out Vportion is advanced far enough to be engaged by the feedpawl. rIhereafter the feed is entirely automatic until the end of the material is reached, the adjustment of the arm A being such that for each operation of the press, the strip is moved just enough to place a succeeding portion beneath the punch. It will be apparent also that my feed-device is not limited to use with punched out strips, as all that is necessary is to provide a shoulder, as at the edge of the hole 13, for the feed-pawl to engage.

In Fig. 3 I have shown a modified form of my invention in which the material is-fed upon the up stroke of the press as distinguishing from the form just described in ,which thefeed is effected upon the down stroke. In order to accomplishl this I preferably adjust the cam 23 so that itis engaged bythe anchor-lug 26 upon the upY stroke of the slide 6, the movement being such that a sufficient amount of material is fed for each stroke of the press.

For the purpose of illustrating my invention I have shown it in several preferred forms but it will be apparent to those skilled in the art that many changes and modifications may be readily made. Furthermore I contemplate applying my invention in other. ways than those shown herein and I do not desire to be limited to the exact structure as shown and described but aim to cover all that which comes within the spirit and scope of the appended claims.

I claim:

1. A feeding devi-ce for punch presses comprising a lever, a feed-pawl carried by the lever and adapted to directly engage a transverse shoulder on the material to ad Vance it from its antecedent progressive position, said shoulder being produced by the press-die, an adjustable cam on said lever and means operated in synchronism with the punch press for engaging the cam l and operating the feed-pawl.

2. A feeding device for punch presses comprising a lever, a hook-shaped feed-pawl ling the feed-pawl, said ca carried by the lever and adapted todirectly engage in a punched opening in the material to advance it from its antecedent progressive position, a slide and means carried by the slide for reciprocating the feed-pawl during downward movement of the slide.

3. A feeding device for punch presses comprising a lever, a feed-pawl carried by.

4the leverand adapted to engage successive shoulders on the material as they are produced by the operation of the press, and adjustable means operated by the press during the operative stroke of the press for operating said feed-pawl so as to progressivelyV draw the material step by step for each operation of the press.- .N l; A feeding device for punch presses comprising a lever, a feed-pawl carried by the lever and adapted to directly engage a transverse shoulder on the material to advance it from its antecedent progressive position, said shoulder being produced by the press-die, a cam on said lever and means operated in synchronism with thev punchpress for engaging the cam and reciprocatbeing adjustable to vary the stroke of said lever.

A feeding device for punch presses comprising a lever,-al reciprocatory feed pawl carried by the lever and adaptedto engage a punched opening in the material to be fed, a slide, means operated by then slide for reciprocating said lever whereby it progressively engages the material so as to feed it for each operation of the press, and adjustableA means interposed between the slide and the lever for varying the stroke of the pawl. j y

6. A feeding device for punch presses comprising a reciprocatory feed-pawl adapted to engage the punched openings i in the material to be fed, a slide yand means actuated during a portion of the downward movement of the slide, for reciprocating said pawl so as to draw the material forwardly step by step for each operation of the press.

7. A feeding device for punch presses comprising a feed-pawl adapted to successively engage the punched openings in the material so as to advance it from its ante! 115 cedent progressive position for each opera'- tion of the press, a pivotally mounted lever so y supporting said feed-pawl, an adjustable cam carried by the lever and in operativerelation to the press-slide for reciprocating the lever to operate the feed-pawl, and a lug on the press slide adapted to engage said cam to swing said lever.

In witness whereof I hereunto subscribe my name this 20th day of September, A. D. 125 1918.

IVAR S. HASSELSTROM. 

